/*!
 * Ext JS Library 3.1.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
/**
 * @class Ext.ux.ValidationStatus
 * A {@link Ext.StatusBar} plugin that provides automatic error notification when the
 * associated form contains validation errors.
 * @extends Ext.Component
 * @constructor
 * Creates a new ValiationStatus plugin
 * @param {Object} config A config object
 */
Ext.ux.ValidationStatus = Ext.extend(Ext.Component, {
    /**
     * @cfg {String} errorIconCls
     * The {@link #iconCls} value to be applied to the status message when there is a
     * validation error. Defaults to <tt>'x-status-error'</tt>.
     */
    errorIconCls: 'x-status-error',
    /**
     * @cfg {String} errorListCls
     * The css class to be used for the error list when there are validation errors.
     * Defaults to <tt>'x-status-error-list'</tt>.
     */
    errorListCls: 'x-status-error-list',
    /**
     * @cfg {String} validIconCls
     * The {@link #iconCls} value to be applied to the status message when the form
     * validates. Defaults to <tt>'x-status-valid'</tt>.
     */
    validIconCls: 'x-status-valid',

    /**
     * @cfg {String} showText
     * The {@link #text} value to be applied when there is a form validation error.
     * Defaults to <tt>'The form has errors (click for details...)'</tt>.
     */
    showText: 'The form has errors (click for details...)',
    /**
     * @cfg {String} showText
     * The {@link #text} value to display when the error list is displayed.
     * Defaults to <tt>'Click again to hide the error list'</tt>.
     */
    hideText: 'Click again to hide the error list',
    /**
     * @cfg {String} submitText
     * The {@link #text} value to be applied when the form is being submitted.
     * Defaults to <tt>'Saving...'</tt>.
     */
    submitText: 'Saving...',

    // private
    init: function (sb) {
        sb.on('render', function () {
            this.statusBar = sb;
            this.monitor = true;
            this.errors = new Ext.util.MixedCollection();
            this.listAlign = (sb.statusAlign == 'right' ? 'br-tr?' : 'bl-tl?');

            if (this.form) {
                this.form = Ext.getCmp(this.form).getForm();
                this.startMonitoring();
                this.form.on('beforeaction', function (f, action) {
                    if (action.type == 'submit') {
                        // Ignore monitoring while submitting otherwise the field validation
                        // events cause the status message to reset too early
                        this.monitor = false;
                    }
                }, this);
                var startMonitor = function () {
                    this.monitor = true;
                };
                this.form.on('actioncomplete', startMonitor, this);
                this.form.on('actionfailed', startMonitor, this);
            }
        }, this, {single: true});
        sb.on({
            scope: this,
            afterlayout: {
                single: true,
                fn: function () {
                    // Grab the statusEl after the first layout.
                    sb.statusEl.getEl().on('click', this.onStatusClick, this, {buffer: 200});
                }
            },
            beforedestroy: {
                single: true,
                fn: this.onDestroy
            }
        });
    },

    // private
    startMonitoring: function () {
        this.form.items.each(function (f) {
            f.on('invalid', this.onFieldValidation, this);
            f.on('valid', this.onFieldValidation, this);
        }, this);
    },

    // private
    stopMonitoring: function () {
        this.form.items.each(function (f) {
            f.un('invalid', this.onFieldValidation, this);
            f.un('valid', this.onFieldValidation, this);
        }, this);
    },

    // private
    onDestroy: function () {
        this.stopMonitoring();
        this.statusBar.statusEl.un('click', this.onStatusClick, this);
        Ext.ux.ValidationStatus.superclass.onDestroy.call(this);
    },

    // private
    onFieldValidation: function (f, msg) {
        if (!this.monitor) {
            return false;
        }
        if (msg) {
            this.errors.add(f.id, {field: f, msg: msg});
        } else {
            this.errors.removeKey(f.id);
        }
        this.updateErrorList();
        if (this.errors.getCount() > 0) {
            if (this.statusBar.getText() != this.showText) {
                this.statusBar.setStatus({text: this.showText, iconCls: this.errorIconCls});
            }
        } else {
            this.statusBar.clearStatus().setIcon(this.validIconCls);
        }
    },

    // private
    updateErrorList: function () {
        if (this.errors.getCount() > 0) {
            var msg = '<ul>';
            this.errors.each(function (err) {
                msg += ('<li id="x-err-' + err.field.id + '"><a href="#">' + err.msg + '</a></li>');
            }, this);
            this.getMsgEl().update(msg + '</ul>');
        } else {
            this.getMsgEl().update('');
        }
    },

    // private
    getMsgEl: function () {
        if (!this.msgEl) {
            this.msgEl = Ext.DomHelper.append(Ext.getBody(), {
                cls: this.errorListCls + ' x-hide-offsets'
            }, true);

            this.msgEl.on('click', function (e) {
                var t = e.getTarget('li', 10, true);
                if (t) {
                    Ext.getCmp(t.id.split('x-err-')[1]).focus();
                    this.hideErrors();
                }
            }, this, {stopEvent: true}); // prevent anchor click navigation
        }
        return this.msgEl;
    },

    // private
    showErrors: function () {
        this.updateErrorList();
        this.getMsgEl().alignTo(this.statusBar.getEl(), this.listAlign).slideIn('b', {
            duration: 0.3,
            easing: 'easeOut'
        });
        this.statusBar.setText(this.hideText);
        this.form.getEl().on('click', this.hideErrors, this, {single: true}); // hide if the user clicks directly into the form
    },

    // private
    hideErrors: function () {
        var el = this.getMsgEl();
        if (el.isVisible()) {
            el.slideOut('b', {duration: 0.2, easing: 'easeIn'});
            this.statusBar.setText(this.showText);
        }
        this.form.getEl().un('click', this.hideErrors, this);
    },

    // private
    onStatusClick: function () {
        if (this.getMsgEl().isVisible()) {
            this.hideErrors();
        } else if (this.errors.getCount() > 0) {
            this.showErrors();
        }
    }
});